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Essentially, the attestation levels are designed to protect the integrity of the telecom networks and provide a way to signal confidence levels to other carriers that the calls can be trusted, and at what level.

Full Attestation (A) - The identity of the caller is known, and they have the right to use the Caller ID for this call. Partial Attestation (B) - The originator knows the identity of the caller, but cannot confirm their right to use the Caller ID.

STIR/SHAKEN digitally validates the handoff of phone calls passing through the complex web of networks, allowing the phone company of the consumer receiving the call to verify that a call is in fact from the number displayed on Caller ID.

Attestation levels are flags set by the carrier to determine the level of confidence in the numbers used as Caller IDs for the calls originating from their end. Based on this, there are three levels of attestation for the SHAKEN/STIR compliance.

The originating telephone service provider checks the call source and calling number to determine how to attest for the validity of the calling number. Full Attestation (A) ? The service provider has authenticated the calling party and they are authorized to use the calling number.

Gateway Attestation (C) - The identity of the caller is not known, as the call originated outside of the network, or internationally. C level is applied when A or B cannot be.

"Gateway Attestation", "C", indicates the call can only be verified as coming from a known gateway, for instance, a connection to another service provider.

How to Write an Attestation Letter?Date of writing the letter.The sender's contact information: name, address (including city and country), phone number, email.The addresse's contact information: name (if it is known), address, phone number, email.Salutation.The subject matter of the letter.More items...

The main purpose of the attestation of a document is to authorize it. Documents can be of various types which need to be proved. The verification of the document is done differently for a different purpose.

Under United States federal law, the applicable portion of the attestation must be completed for each passenger age two or older and the attestation must be provided to the airline or aircraft operator prior to boarding a flight to the United States from a foreign country.